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Date: Sun, 4 Mar 2018 20:53:54 +0100
From: Pavel Machek <pavel@ucw.cz>
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Subject: Re: A case of watchdog+LED shared GPIO pin
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On Sun 2018-03-04 22:45:35, =D0=98=D0=BB=D1=8C=D1=8F=D1=81 =D0=93=D0=B0=D1=
=81=D0=B0=D0=BD=D0=BE=D0=B2 wrote:
> 2018-03-04 22:19 GMT+03:00 Pavel Machek <pavel@ucw.cz>:
> > Improving WDIOC_SETTIMEOUT is obvious solution. I'd go for that.
>=20
> Question is, then, - how to do it in a backwards-compatible manner?
> There is very likely to be some userspace software out there which
> relies on the assumption of the currently used whole seconds semantics
> being in effect.
>=20
> Add a new millisecond argument? But how to detect its presence in the han=
dler?
>=20
> Introduce a new ioctl? But how to do it neatly and reasonably?

New ioctl. Start from the old one. Keep it neat :-). Negotiate with wd
maintainers if that's ok with them, first.
									Pavel
--=20
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo=
g.html

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